Is this a first order differential equation? I'm asking because I do not know how to perform the technique Mr. Fantastic suggested.

Yes it is. But I don't understand why you're trying to solve it if you haven't been taught the technique ...? Have you reviewed your class notes and textbook (just in case you have been taught and have just forgotten)

No, unfortunately our original teacher died before we could learn the material and our new substitute cannot speak english very well so it is very difficult to follow his teaching. He has assinged the problem and has not taught it. I need the solved version of this for him. Thank you very much for your help mr fantastic.

No, unfortunately our original teacher died before we could learn the material and our new substitute cannot speak english very well so it is very difficult to follow his teaching. He has assinged the problem and has not taught it. I need the solved version of this for him. Thank you very much for your help mr fantastic.